Fastener



Patented Sept. 24, 1935 z,o15,1s9

Original application June i7, 1930, serial No. 461,761, now Patent No.

1,912,099. Divided and this .application March 25,. 1933, y'Serial No.

This invention relates to improvements in anchorage means especially adapted for vanchoring lsheet metal to wood or like supports and for anchoring two or more sheets of metal together independently of any such support, this application being a division of my co-pending application Serial No.461,761, filed June 17, 1930 issued May 30, 1933, as Patent No, 1,912,099, and

through the said co-,pending application being a division in part of my application Serial No.l

' 282,732, filed June 4, 1928, since patented on February 9 1932, Patent No. 1,844,823.

In my Patent No. 1,411,184, dated March 28, 1922, is s et forth an art orprocess characterized by the forming of a cylindrical opening lin sheets of metal and the insertion of a hardened thread screw in such cylindrical opening, the opening be'- ing substantially equal to the /diameter of the main body ofthe screw, and the screw having a tapering entering tip` to facilitate introduction of the screw. In carrying out the practice of my said patent, it has for years been customary to first forma cylindrical opening either-by the f use of such a punch as is shown in my said patent, or by the employment-cfa shearing punch or drill and afterwards introducing the screw. The

present invention, however, is characterized by incorporating in a single instrumentality the a0 punching means or tool as an integral part with my said patent, I have received various patents for fasteners and anchorage devices having threadedor ribbed anchorage means all adapted for introduction into ready-made openings in work, as, -for example, my Patent No. 1,482,151, dated January 29, 1924 and particularly Figure 7, discloses a driven fastener having a tapering entering tip constructed to assist inbringing the fastener into correct alinement with the previously prepared opening. Likewise, my Patent No. 1,545,471, dated July 7, 1925, discloses a similar ly pointed entering end to aid in finding the prepared opening in the work and bringing the pilot portion into exact alinementtherewith. In my Patent NQ. 1,526,182, dated` February 10, 1925, is seen the pilot without the hole-finder tip, but '1 with the thread vanishing into thebody of the screw at the beginning of the pilot to facilitate draw or biting intothe material by the thread, but in`none'of these nor in any structure of which I am aware has there been any attempt to incorporate in one and the same 4device the hole-making instrument and the'anchoring instrument. It is an object of the present invention to incorporate these two into one instruthe anchorage means or screw. Subsequent to mentality enabling eective application without resort to supplementing toolsand without the inconvenience of requiring a separate tool for each different size of screw or anchorage device to -be applied.

With these and further objects in view as will in part hereinafter become apparent and in part be stated, the invention includes the combination of arhole-forrning tool shaped and proportioned to provide a cylindrical hole in a sheet of metal and a threaded or ribbed instrument integralwith said tool and following the same for effecting anchorage in the walls of the sheet metal surrounding the cylindrical opening. Y

The invention also comprises certain other novel constructions, combinations, and arrangements of parts as subsequently speciiied and claimed.

In the accompanying drawing`,-

Figure 1 is a view in side elevation-of an embodiment of the present invention illustrated as in the position'in the course of formation of the cylindrical opening, ther parts being seen on a scale enlarged beyond the average, normal commercial sizes. 25 Figure 2 is a similar view of the same illustrated in its nallyseated and secured position.

Figure 3 is atransverse section taken. onthe plane indicated by line 3-3 of Figure 2, and looking downward. 30

Figure 4 is a view similar to Figure'2 on a reduced Ascale showing amodied application ,of the fastener.

Figure 5 is a view in side elevation of "a modied embodiment of the fastener shown in the 35Y initial position4 just prior to` the formation of the fastener-receiving-opening.

screw in its finally seated position' in the work. t

Referring to the drawing by numerals, `l indicatesl an ordinary sheathing board or other `support for sheet metalrooflng or other .sheet 45 metal 2. The sheet 2 vbeing placed upon'the wooden vsupport l is anchored thereto by the driving of an anchorage device through the metal sheet and into the support, said anchorage device consisting of a pin-like body provided with a smooth entering portion 3 havingan entering-pointed'ti'p 4. Because of its function, the portion 3 will be herein referred to as-the shap- Ying tool. The pin-like body outward or upward from'the shaping tool 3 isv formed with high Figure 6 isa similar view of the same showing i l pitched rolled threads 5, 5. The threads may be otherwise formed than rolled, but, as a matter of commercial practicability and inexpensiveness, the rolling of the threads 5 is preferred, because it is an important feature of the present invention that the threads outstand laterally beyond the extended lines of the cylinder forming the shaping tool. In other words, the diameter of shaping tool 3 is considerably less than the distance from the farthest outstanding point of a given thread 5 and the farthest outstanding point of a diametrically opposite thread 5, as best seen in Figure 3. At the outer extremity, the pin is preferably formed with an appropriate head 6, which is proportioned according to the character of work to be done, and usually assumes a relatively wide diameter for the purpose of providing a broad bearing surface.

The smooth portionl 3 with its penetrating point 4 comprises a shaping and finishing tool for producing a downwardly extending burr 1 from the metal 2, which burr terminates in serrated, irregular edges 8 projecting laterally into the wood of the support I. 'I'he burr`1 is formed into a short cylinder by the action' ofthe finishing tool portion 3 proportioned to receive the threads 5 and to be entered by such threads preferably for a portion of the thickness of the burr, that is, the thickness of the sheet l. The threads 5 will enter the cylindrical burr 1, as indicated at 8', 8', in Figure 2, for a depth only equal to the distance to which each thread 5 outstancls laterally beyond the extended line of the cylinder 3, but will enter to that extent and in some instances 'a slightly greater depth of entry will be indicated incident to a slight flowing of the metal of burr 'I along the entering threads 5 incident to the parting of the metal as the threads enter the same. Of course, it will be understood that the threads 5 in entering the metal of the burr 1 will tend .to spread the burr, but such spreading action will be resisted both by the cylindrical burr and by the compressed wood of support vI which surrounds the burr 1. Thus, each part reacts against the other so that the three parts, the

surrounding wood, the surrounding burr 1, and

A diameter of the pin carrying threads 5, and the -said threads cannot escape from the metal both because of the high frictional resistance of the metal burr l to any retrograde movement of the threads 5 and also because the fiber of the wood will have sprung to a position overhanging the interlock or shouldered portion 3', best seen in Figure 3, produced by the upper terminus of the smooth portion or forming tool 3. Thus, the screw-threaded pin will lbe effectively held against upward or outward release even under the strain of varying temperature conditions, and the three parts consisting of the Wood, the burred sheet metal, and the pin body will thus be anchored together as a unit.

The sheet 2 may be treated in any manner desired according to common practice after the anchorage by the present improved anchoring pinv upon reaching its seated position, as indicated in Figure 2. When sheet 2 is part of a roof, one acceptable mode of connection of another sheet of metal to the sheet shown in Figure 1 is indicated in Figure 2 in which the fiat seam lock joint is shown as formed and flattened down upon the head 6, and then further anchored by appropriate soldering 9 for preventing the possibility of leakage, and avoiding the danger of rusting of tance that the threads 5 be case-hardened and also that the forming or shaping tool 3 be casehardened in order that the burr 'l be effectively formed in the first place to snugly surround the forming tool 3, and further in order that the threads 5 may produce corresponding or female threads 8' in the burr 'l which will be clear-cut and effective. It has beenproposed in various industrial arts to effect a close contact by providing threads or ribs of soft metal to be forced into driven contact with surrounding work of the same kind of metal with the result that parts are stripped from both and a fairly intimate initial contact is attained which is not sufficiently close to be permanently maintained. 'I'he present invention effectively avoids such unsatisfactory condition by the hardening of the anchoring pin so that the threads 5 will cut their way into and through the parts\ of the surrounding wallv formed of the burr 1, and the interlocking anchorage thus produced between the burr and the pin has proved by repeated tests to be permanent.

Of course, the pitch of the thread 5 is capable of variation, but it is desirable that the pitch should be sufficiently high to enable the pin to be driven in by hammer blows delivered at the outer end yof the pin and to cause the pin to rotate while being so driven, whereby the threads 5 track in the initially formed female threads 8'. Obviously, this would not result if the threads 5 were of the same or less maximum diameter as 45 One usage slightly varying from that just de- 50 scribed is shown in Figure 4 in which the parts correspond to those above described and the same reference numerals have been applied and the same description will equally apply, except that the metal sheet 2 as seen in Figure 4 is in the form of a disc or fragment resting on a sheet 2". The sheet 2" may be of impervious felt' or other paper or other sheeting for use as roofing or as a covering for the sheathing of a frame structure, or for any other appropriate usage. The burr 1 formed from the metal sheet 2', as will be clear from Figure 4, functions the same as above described, but in doing so must penetrate the sheet 2". Thus, the invention is well adapted for anchorage of tar paper or like roofing or paper web for any purpose.

It is important to observe that the best anchorage obtainable with a hardened thread fastener is regularly vsecured by the introduction of such a fastener through a cylindrical opening, the

same to screws of the general type of wood screws, such, for instance, as is disclosed in my Patent No. 1,465,148, dated August 14,1923, a structure as seen in Figures 5, 6, and 7 results possessing all of the advantages of self-formation of a correctly contoured opening plus the effective anchorage resulting from a hardened thread screw of the wood screw type being threaded into an opening in work of the cylindrical form having a diameter substantially the same as that of the body of the screw. In such structure, I0 is the body of the screw having the usual head II and threads I2 all corresponding substantially to the contour of an ordinary wood screw. The screw structure, however, does not terminate in the conventional gimlet tip, but instead is formed into a cylindrical hole-forming tool I3 corresponding to the tool 2, above described, and terminating in a penetrating point I4. In the use of the fastener seen in Figure 5, the operation differs from that described chiefly in the use of a screw-driver or like lns'trument for rotating the screw instead of hammer A hammer blow is delivered` driving it into place. to the head II while the tip I4 is resting on work I5, which may consist of two or more sheets of metal or of a single sheet mounted on a wooden body I0, which body is commonly referred to in f shop practice as the root diameter of the screw.

The blow on the head II should be suicient to cause the entering end of thread I2 to reach contact with the material of work I5, the said entering end of thread I2 tapering to and blending into the body I so as to facilitate entrance -of the thread into the material of the work after the and, therefore, requires no further description. s

What is claimed ls:-

1. A fastener for sheet metal work and other material comprising a body having an integral 4 .forming tool at its entering end portion for forming a substantially cylindrically-shaped, tubular l0 burr of sheet metal upon penetrating a sheet of metal under the force of a hammer blow delivered to the fastener, said tool comprising an entering tip and a substantially cylindrical shank of a length greater than its thickness, the body havl5 ing a rib outward of the tool extending in the general direction of the length of the body and outstanding laterally of the body a distance sulcient to overhang the extended lines of the cylindrical portion of the tool and being proportioned 20 to substantially uniformly overhang said extended lines, and being thus positioned, when the fastener is advanced beyond the engagement of the tool with the sheet of metal, to enter the material of the walls of the substantially cylindrical burr 26 formed by the tool, the tool and rib being hardened suiliciently for entering metal, such as soft iron or soft steel, substantially without injury to the tool or rib.

2. vA fastener for fastening together sheets of 30 metal comprising a body having an integral forming tool at its entering end portion for forming a substantially cylindrically shaped tubular burr of, sheet metal upon penetrating a sheet of metal under the force of a hammer blow delivered to the 55 fastener, said integral forming tool consisting of an entering tip and a substantially cylindrical shank of a length greater than its thickness, and the fastener body having a rib outward of said tool in the length of the fastener spiralling about 40 the body at a pitch sufiiciently low to encircle the body in a distance not exceeding the diameter of the body for enabling said rib to be forced into work by exteriorly applied rotary force rotating the body, -and-the rib outstanding laterally of the body a distance sucient to overhang the extended lines of the cylindrical portion of the tool and beingv proportioned to substantially uniformly overhang said extended lines, the entering tool and rib being hardened suiiiciently for entering metal, such as soft iron or soft steel, substantially without injury thereto.

` HEYMAN RosENBERci. 

